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Accuracy and Resolution Analysis of a Direct Resistive Sensor Array to FPGA Interface.

Óscar Oballe-Peinado^1,2, Fernando Vidal-Verdú^3,4, José A Sánchez-Durán^5,6

¹Departamento de Electrónica, Universidad de Málaga, Andalucía Tech, Campus de Teatinos, Málaga 29071, Spain. oballe@uma.es.

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|February 4, 2016

Summary

This study introduces a novel FPGA-based method for resistive sensor arrays, eliminating analog-to-digital converters and reducing crosstalk. This approach enables parallel measurements, enhancing accuracy for tactile sensor applications.

Keywords:

FPGAs direct sensor-to-digital device interface parallel analogue data acquisition resistive sensor arrays

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Area of Science:

Electrical Engineering
Sensor Technology
Embedded Systems

Background:

Resistive sensor arrays are crucial for various applications but often suffer from complex conditioning circuits and resistive crosstalk.
Traditional methods require analog-to-digital converters (ADCs), increasing system complexity and cost.

Purpose of the Study:

To propose a direct Field-Programmable Gate Array (FPGA) connection for M x N resistive sensor arrays.
To eliminate the need for ADCs in resistance measurement.
To mitigate resistive crosstalk inherent in simultaneous resistor measurements.

Main Methods:

A novel circuit architecture using only capacitors for column conditioning.
An FPGA-integrated addressing technique for parallel row resistor measurement.
Experimental assessment of calibration techniques on a discrete resistor array.

Main Results:

Elimination of typical resistive crosstalk during parallel measurements.
A new calibration model achieved a maximum relative error of 0.066% for tactile sensor resistance values.
Identified new elements impacting discharge times and measurement uncertainty that require further study.

Conclusions:

The proposed FPGA-based architecture offers a simplified and effective solution for resistive sensor arrays.
The method significantly reduces system complexity by removing ADCs and mitigating crosstalk.
Further research is needed to fully characterize and minimize the impact of discharge time variations on measurement accuracy.